From the hotkey list:
Shift + [ Drop Passive Sonobuoy, Shallow - Over Layer
[ Drop Passive Sonobuoy, Deep - Under Layer
Shift + ] Drop Active Sonobuoy, Shallow - Over Layer
] Drop Active Sonobuoy, Deep - Under Layer
And Pg 68 in the manual:
"4.1.2 ASW-specific Actions:
Drop Passive Sonobuoy: If the aircraft has sonobuoys in its
inventory, it drops it. Sonobuoys can be dropped above or
below the thermal layer (see 9.2.3, Submarine Combat). Passive
sonobuoys are the main source of anti-submarine warfare.
Drop Active Sonobuoy: This drops a sonobuoy that actively
pings. As the submarine will know it’s being watched, active
sonobuoys are traditionally used only to pinpoint the exact
location of an already-detected contact prior to an attack.
Deploy Dipping Sonar: If the aircraft is a helicopter with a
dipping sonar, it stops, hovers low, and deploys it.
Function key functions: Allow you to call on unit level functions.
See the shortcut bar, “Buttons and Windows” for more information."
I know about manual method, but manually searching for subs (dropping buoys) in 48h mission is no fun.
IMHO, (and Unfortunately), for modern diesel boats you will have to manually lay a pattern to get something reasonably efficient. This is because the range of a sonobuoy v. a particular SSK will vary depending on the quietness of the target, the noise environment, and whether the target is above/below the layer. CMO doesn't automatically figure out the average detection range of a sonobuoy and then calculate spacing and type. For VP ops, I usually designate an patrol area and manually help the VP lay the buoy pattern, using my knowledge and experience in CMO to determine spacing and type of buoy. In general, in CMO if I don't know what depth the sub is at, for a modern SSK I do a pattern with about 1.5 nm spacing with a shallow-Shallow-Deep pattern. If I think I may have in idea of where the sub is, I drop an active buoy. If I want to drive the sub either to, or away from an area, I will drop an active buoy positioned to help elicit the desired behavior. Sometimes, when you do this, the sub will increase speed and be picked up by your passive buoys.
While it is a bit of a pain to micro-manage the pattern, once you have it deployed, it is just a matter of monitoring it. You can also keep your surface search radar on to keep the sub from going to periscope depth. One thing: don't expect results quickly. ASW is "Awfully Slow Warfare". The buoy pattern merely sets up a barrier that maximizes your chance of the SSK passing near enough a buoy to get a detection. That frequently takes a lot of time.
FYI, you will burn through buoys doing this. However, this is realistic. One thing to keep in mind regarding ASW. You don't have to kill the sub to win. You only have to prevent him from killing you. If you can hold down a SSK and prevent him from maneuvering to get a shot on your HVU, you win.
< Message edited by CV60 -- 10/11/2021 8:42:51 PM >